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الإعدادات

الإعدادات

1. US5319165 - Dual bandpass secondary source

المكتب الولايات المتحدة الأمريكية
رقم الطلب 07862884
تاريخ الطلب 03.04.1992
رقم النشر 5319165
تاريخ النشر 07.06.1994
رقم التسليم 5319165
تاريخ التسليم 07.06.1994
نوع النشر A
التصنيف الدولي للبراءات
Description not available in lang ar
Description not available in lang ar
Description not available in lang ar
F01N 1/06
G10K 11/00
G10K 11/178
التصنيف التعاوني للبراءات
H04R 1/227
F01N 1/065
G10K 11/178
G10K 2210/1053
G10K 2210/112
G10K 2210/12822
مودعي الطلبات Ford Motor Company
المخترعين Geddes Earl R.
الوكلاء May Roger L.
Mollon Mark L.
بيانات الأولوية 07514624 25.04.1990 US
الاسم
(EN) Dual bandpass secondary source
الملخص
(EN)

An active muffler for use in motor vehicles comprises a sensor, an electronic control responsive to the signal generated by the sensor for producing a drive signal delivered to a transducer which emits cancellation pulses phased 180.degree. from the sound pressure pulses passing through a conduit, where both front and rear sides of the transducer are acoustically coupled to the conduit to improve the efficiency of the transducer operation. Preferably, the acoustic coupling comprises an enclosed chamber including a port for communicating with the conduit which can be tuned to resonate at predetermined frequencies. When both sides of the transducer are so coupled to the conduit, the transducer has increased efficiency over a broad band of frequencies, and the frequency band can be broadened at the low end as required to accommodate the frequencies generated by a source of noise. A tandem transducer mounting arrangement according to the present invention reduces vibration of the housing. The system is particularly suitable for use in adapting noise cancellation techniques to replace passive mufflers on motor vehicles.

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